Car seats that can transform into beds independently

Abstract

This invention discloses a car seat capable of independently transforming into a bed, comprising a base, a seat cushion assembly mounted on the base, a backrest disposed at the rear end of the seat cushion assembly, and a swing arm extending towards the base from the side of the backrest. The lower end of the swing arm is rotatably connected to the base, and the swing arm rotates forward relative to the base, allowing the backrest to fold flat and connect to the front end of the seat cushion assembly. The seat cushion assembly includes an upper seat cushion and a lower seat cushion arranged overlapping each other, and the upper seat cushion can be flipped backward relative to the lower seat cushion to a horizontal state. The beneficial effect of this invention is that it can be conveniently and quickly transformed into a bed.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to an automotive seat that can independently transform into a bed. Background Technology

[0002] With rapid economic development, automobiles have become the most important means of transportation for people, and users' demands for cars are also increasing. Users expect vehicles to provide multi-functional usage scenarios, such as long-distance travel and camping, and to offer spaces for rest and sleep. In response to these needs, some large SUVs and commercial vehicles have introduced a double-bed rest mode so that users can lie down and rest.

[0003] However, in the current automotive industry, reclining and sleeping functions are typically achieved in the following ways: 1. Combining the first and second row seats to form a bed; 2. Folding down the backrests of the second and third row seats to form a bed with the trunk floor. Both of these methods require both rows of seats to be combined or simultaneously combined with the trunk floor to form a bed, which is technically difficult, cumbersome, and lacks spatial adaptability, presenting numerous drawbacks.

[0004] Therefore, there is an urgent need to design a seat that can be independently transformed into a bed to solve the technical problems of the current cumbersome steps and difficult operation of converting car seats into beds. Summary of the Invention

[0005] In view of this, the present invention provides a car seat that can be independently transformed into a bed, which can be conveniently and quickly transformed into a bed.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A car seat capable of independently transforming into a bed includes a base, on which a seat cushion assembly is disposed, and a backrest is disposed at the rear end of the seat cushion assembly. The key feature is that: the backrest has a swing arm extending towards the base on its side, the lower end of the swing arm is rotatably connected to the base, and the swing arm rotates forward relative to the base, enabling the backrest to be folded flat forward and connected to the front end of the seat cushion assembly; the seat cushion assembly includes an upper seat cushion and a lower seat cushion arranged overlapping each other, and the upper seat cushion can be flipped backward relative to the lower seat cushion to a horizontal state.

[0008] With the above structure, the lower and upper seat cushions overlap when the car seat is in a seated position to ensure normal seat function. When the user needs to lie down and rest, the swing arm is rotated forward with the base as the pivot point, which causes the swing arm and the backrest above it to flip over, so that the backrest is flat and connected to the front end of the seat cushion assembly. Then, the upper seat cushion is flipped backward to a horizontal position. At this time, the backrest, lower seat cushion and upper seat cushion are connected to form a bed.

[0009] Preferably, the base is provided with a first drive mechanism to drive the lower end of the swing arm to rotate.

[0010] Preferably, a flipping drive mechanism is provided between the upper and lower seat cushions, which is used to drive the upper seat cushion to flip backward relative to the lower seat cushion.

[0011] Preferably, the flipping drive mechanism includes a drive assembly, a first gear fixedly mounted at the rear end of the lower seat cushion, a second gear rotatably mounted at the rear end of the upper seat cushion, and a retainer; the drive assembly is used to drive the second gear to rotate circumferentially around the first gear.

[0012] The two ends of the retainer are respectively rotatably sleeved at the axial positions of the first gear and the second gear, so that the second gear and the first gear can maintain a continuous meshing state.

[0013] Preferably, the drive assembly includes a third gear rotatably mounted at the rear end of the lower seat cushion and a first driver that drives the third gear to rotate. The third gear is coaxially arranged with the first gear and meshes with a second gear.

[0014] Preferably, the transmission ratio between the first gear, the second gear, and the third gear is 1:1:1.

[0015] Preferably, the backrest side is rotatably connected to the upper end of the swing arm, and an electric angle adjuster is provided between the backrest side and the upper end of the swing arm.

[0016] Preferably, the lower end of the swing arm is rotatably positioned at the middle of the base along its length.

[0017] Preferably, the upper end of the backrest is equipped with a headrest that can be folded forward, and the backrest is provided with a second drive mechanism for driving the headrest to rotate back and forth relative to the upper end of the backrest.

[0018] Preferably, the lower end of the backrest side is provided with a downwardly extending blocking component, which can cover the gap between the backrest and the seat cushion assembly when the backrest is folded forward and flattened at the front end of the seat cushion assembly.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The car seat provided by this invention can be independently transformed into a bed. In the sitting position, the lower seat cushion and the upper seat cushion are arranged in an overlapping manner. When the user needs to lie down and rest, the swing arm is rotated forward with the base as the pivot point, which drives the swing arm and the backrest connected to its upper end to flip over as a whole, so that the backrest is flat and connected to the front end of the seat cushion assembly. Then the upper seat cushion is flipped backward to a horizontal state. At this time, the backrest, the lower seat cushion and the upper seat cushion are connected to form a bed.

[0021] 2. The seat transformation structure has technical advantages such as convenient operation, high flatness after the bed is formed, and good spatial adaptability. At the same time, the seat cushion adopts a double-layer structure design. By unfolding the upper seat cushion backward to a horizontal state, the support area of ​​the bed can be expanded, ensuring sufficient support length, so as to adapt to users of different body types.

[0022] 3. The structure design of the flip drive mechanism has the advantages of high transmission efficiency and high motion precision, which improves the stability of the upper seat cushion rotation. Secondly, the vibration generated between the gears during transmission is small, which can reduce transmission noise and improve the user experience. In addition, each gear is small in size and light in weight, and has strong load-bearing capacity, making it especially suitable for use in cars with limited space.

[0023] 4. By enabling the car seats to be converted into a bed with a single touch, the number of operation steps can be reduced, the intelligence and premium feel of the whole vehicle can be enhanced, and the surface of the seats after being converted into a bed is simple and flat, with the advantage of good overall appearance. Attached Figure Description

[0024] Figure 1 This is a structural diagram of a car seat;

[0025] Figure 2 This is another structural diagram of a car seat;

[0026] Figure 3 This is a structural diagram of a car seat in its bed-like configuration.

[0027] Figure 4 This is a schematic diagram of the internal frame structure of a car seat in a seated position.

[0028] Figure 5 This is a schematic diagram of the structure when the lower seat cushion A2 and the upper seat cushion A3 overlap (the surface cover has been hidden);

[0029] Figure 6 This is a rear view of the lower seat cushion A2 and the upper seat cushion A3 when they overlap (the surface cover is hidden).

[0030] Figure 7 This is a structural diagram of the seat cushion assembly in bed-like mode (surface cover has been hidden);

[0031] Figure 8 This is a structural diagram showing the lower seat cushion A2 after the support plate A5 is installed (the surface cover has been hidden);

[0032] Figure 9 This is a schematic diagram illustrating another embodiment of the flipping drive mechanism 4. Detailed Implementation

[0033] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0034] like Figure 1 and 3 As shown, a car seat capable of independently transforming into a bed includes a base A1, on which a seat cushion assembly is mounted, and a backrest 1 is arranged at the rear end of the seat cushion assembly. A swing arm 2 extending towards the base A1 is provided on the side of the backrest 1. The lower end of the swing arm 2 is rotatably connected to the base A1. The swing arm 2 rotates forward relative to the base A1, allowing the backrest 1 to fold forward and flatten, connecting to the front end of the seat cushion assembly. The seat cushion assembly includes an upper seat cushion A3 and a lower seat cushion A2 arranged overlapping each other. The upper seat cushion A3 can be flipped backward relative to the lower seat cushion A2 to a horizontal state.

[0035] In this design, when the car seat is in a seated position, the lower seat cushion A2 and the upper seat cushion A3 overlap to ensure normal seat function. When the user needs to lie down and rest, rotating the swing arm 2 forward with the base A1 as the pivot point causes the swing arm 2 and its upper backrest 1 to flip over, making the backrest 1 face forward and connect to the front of the seat cushion assembly. Then, the upper seat cushion A3 is flipped backward to a horizontal position. At this point, the backrest 1, lower seat cushion A2, and upper seat cushion A3 are connected to form a bed. Based on this, by manually or electrically flipping the backrest 1 and upper seat cushion A3, the car seat can be independently transformed into a bed. This has the technical advantages of convenient operation, high flatness after bed formation, and good spatial adaptability. At the same time, the seat cushion adopts a double-layer structure design. By unfolding the upper seat cushion A3 backward to a horizontal position, the support area of ​​the bed can be expanded, ensuring sufficient support length, thus accommodating users of different body types.

[0036] The following details an implementation structure for electrically controlling the backrest 1 to tilt forward and the upper seat cushion A3 to flip backward.

[0037] like Figure 4 As shown, the base A1 is equipped with a first drive mechanism 3, which drives the lower end of the swing arm 2 to rotate around the base A1. The first drive mechanism 3 drives the lower end of the swing arm 2 to rotate forward around the base A1, causing the upper end of the swing arm 2 to rotate forward with the lower end of the swing arm 2 as the rotation center, thereby driving the backrest 1 at the upper end of the swing arm 2 to flatten forward to the front end of the seat cushion assembly (see reference). Figure 3 This enables the electric control of the backrest 1's flipping mechanism. Similarly, the first drive mechanism 3 drives the lower end of the swing arm 2 to rotate backward around the base A1, which can drive the backrest 1 back to the sitting position.

[0038] Revisit Figure 1 and 4In this embodiment, two sets of swing arms 2 are provided, symmetrically arranged on both sides of the backrest 1. The upper ends of the two sets of swing arms 2 are respectively connected to the two sides of the lower end of the backrest 1, and the lower ends of the two sets of swing arms 2 are respectively rotatably connected to the two sides of the base A1. A first synchronizing rod 8 is connected between the lower ends of the two sets of swing arms 2 and the base A1. The first driving mechanism 3 can be an angle adjustment driver. The first driving mechanism 3 drives the first synchronizing rod 8 to rotate, which can drive the lower ends of the two sets of swing arms 2 to rotate synchronously around the base A1. In this embodiment, both sets of swing arms 2 are constructed as curved structures, and the lower ends of the swing arms 2 are rotatably located in the middle of the length direction of the base A1. This design can increase the swing amplitude of the swing arms 2, ensuring that when the swing arms 2 rotate forward, they can drive the lower end of the backrest 1 to rotate from the rear end of the seat cushion assembly to the front end of the seat cushion assembly.

[0039] Depend on Figure 4 As can be seen, the upper end of the swing arm 2 is rotatably connected to the side of the backrest 1. The connection structure between the two sets of swing arms 2 and the backrest 1 is the same, and will not be described in detail here. Electric angle adjusters 9 are provided between the lower ends of the backrest 1 and the upper ends of the two sets of swing arms 2. The electric angle adjusters 9 can drive the backrest 1 to rotate back and forth around the upper end of the swing arm 2, realizing the tilt angle adjustment of the backrest 1 when the seat is in a sitting position. When the seat is transformed into a bed, the backrest 1 can be adjusted to an upright position first, and then the swing arm 2 can be driven to rotate through the first drive mechanism 3, causing the backrest 1 to flip forward, or the backrest 1 can be driven to flip forward first, and then the backrest 1 can be driven to rotate relative to the upper end of the swing arm 2 through the electric angle adjuster 9, so as to ensure the flatness of the backrest 1 after it is connected to the seat cushion assembly.

[0040] Please refer to Figure 6 A flipping drive mechanism 4 is provided between the upper seat cushion A3 and the lower seat cushion A2. The flipping drive mechanism 4 can drive the upper seat cushion A3 to flip backward relative to the lower seat cushion A2, so that when the seat is transformed into a bed, the upper seat cushion A3 can automatically flip backward to a horizontal state relative to the lower seat cushion A2, thereby expanding the support area of ​​the bed.

[0041] Further, refer to Figure 5 and 7The flipping drive mechanism 4 includes a drive assembly, a first gear 41 fixedly mounted on the rear end of the lower seat cushion A2, a second gear 42 rotatably mounted on the rear end of the upper seat cushion A3, and a retainer A4. The second gear 42 meshes with the first gear 41. The drive assembly drives the second gear 42 to rotate circumferentially around the first gear 41, thereby causing the upper seat cushion A3 to rotate around the rear end of the lower seat cushion A2. The retainer A4 is rotatably sleeved at both ends at the axial positions of the first gear 41 and the second gear 42, respectively, so that the second gear 42 and the first gear 41 can maintain a continuous meshing state. With this structural design, in the seated mode, the second gear 42 is located above the first gear 41. Under the holding action of the retainer A4, the drive assembly drives the second gear 42 to rotate backward around the first gear 41. This causes the rear end of the upper seat cushion A3 to rotate backward relative to the rear end of the lower seat cushion A2, allowing the upper seat cushion A3 to flip backward relative to the lower seat cushion A2 to a horizontal position. Furthermore, the upper side of the flipped upper seat cushion A3 is flush with the upper side of the lower seat cushion A2, ensuring the flatness of the surfaces of the upper and lower seat cushions after the upper seat cushion A3 is unfolded. Using gear transmission, after the machine stops, the self-locking action of the meshing gears allows the upper seat cushion A3 to stably maintain a horizontal position.

[0042] Furthermore, such as Figure 5 and Figure 6 As shown, the drive assembly includes a third gear 43 rotatably mounted on the rear end of the lower seat cushion A2 and a first driver 44 that drives the third gear 43 to rotate. The third gear 43 is coaxially arranged with the first gear 41 and meshes with the second gear 42. The first driver 44 drives the third gear 43 to rotate. Since the first gear 41 is fixedly mounted on the rear end of the lower seat cushion A2 and the second gear 42 is rotatably mounted on the rear end of the upper seat cushion A3, and the second gear 42 meshes with both the first gear 41 and the third gear 43, the rotation of the third gear 43 can drive the second gear 42 to rotate on its own axis and also revolve around the axis of the first gear 41, which means that it can cause the upper seat cushion A3 to tilt backward relative to the lower seat cushion A2. This transmission structure offers advantages such as high transmission efficiency and high motion precision, improving the stability of the upper seat cushion A3 rotation. Secondly, the vibration generated between gears during transmission is small, reducing transmission noise and enhancing the user experience. In addition, the small size and light weight of each gear provide strong load-bearing capacity, making it particularly suitable for use in cars with limited space.

[0043] Depend on Figure 6 and 7As can be seen, in this embodiment, there are two sets of the first gear 41, the second gear 42, the third gear 43, and the cage A4, which correspond one-to-one. The two sets of first gears 41 are fixed on both sides of the rear end of the lower seat cushion A2, the two sets of second gears 42 are rotatably mounted on both sides of the rear end of the upper seat cushion A3, and the two sets of third gears 43 are rotatably mounted on both sides of the rear end of the lower seat cushion A2. In the transmission mechanism on the same side, the third gear 43 is coaxially arranged with the first gear 41, and the third gear 43 is located inside the first gear 41. The cage A4 is located at the outer end, and both ends of the cage A4 are rotatably connected to the axial positions of the first gear 41 and the second gear 42 respectively through pins a. Furthermore, a second synchronizing rod 45 is connected between the third gears 43 on both sides of the lower seat cushion A2. The first driver 44 drives the second synchronizing rod 45 to rotate, which can drive the two third gears 43 to rotate synchronously, thereby driving the second gears 42 on both sides of the upper seat cushion A3 to rotate on their own axis while revolving around the corresponding first gear 41, thereby driving the upper seat cushion A3 to flip backward to a horizontal state.

[0044] In this embodiment, the transmission ratio between the first gear 41, the second gear 42, and the third gear 43 is 1:1:1. This design ensures that the structure of the first gear 41, the second gear 42, and the third gear 43 is minimized. Simultaneously, after the upper seat cushion A3 and the lower seat cushion A2 are fitted with the top cover, the size of the gears can perfectly match the thickness of the upper seat cushion A3 and the lower seat cushion A2 (see reference). Figure 1 and Figure 3 This enhances the overall aesthetics of the seat. In practical applications, refer to... Figure 3 The seat cushion assembly has a cover A6 on the side corresponding to the gear position, which can cover and protect the components.

[0045] In addition to the above-described embodiments, the flipping drive mechanism 4 can also be referred to... Figure 9 The flipping drive mechanism 4 includes a fixed gear 46 fixedly mounted at the rear end of the lower seat cushion A2, a rotating gear 47 rotatably mounted at the rear end of the upper seat cushion A3, a rotating arm 48 rotatably disposed on the side of the lower seat cushion A2, and a second driver 49 that drives the rotating arm 48 to rotate. The rotating gear 47 and the fixed gear 46 are meshed and driven together. The rotation center of the rotating arm 48 coincides with the center line of the fixed gear 46, and the rotating arm 48 is rotatably engaged with the rotating gear 47. The second driver 49 drives the rotating arm 48 to rotate rearward around its rotation center with respect to the lower seat cushion A2, thereby causing the rotating gear 47 to rotate circumferentially around the fixed gear 46, thus causing the upper seat cushion A3 to flip rearward relative to the lower seat cushion A2 to a horizontal state.

[0046] Further, refer to Figure 9The rotating arm 48 is arranged outside the fixed gear 46. The second driver 49 has an output shaft 491, which passes through the fixed gear 46 from the inside to the outside and is fixedly connected to the outer rotating arm 48. The second driver 49 drives the output shaft 491 to rotate, which in turn drives the rotating arm 48 to rotate. In this embodiment, there are two sets of fixed gears 46, planetary gears 47, and rotating arms 48, which correspond one-to-one. The two sets of fixed gears 46 are located on both sides of the rear end of the lower seat cushion A2, and the two sets of planetary gears 47 are located on both sides of the rear end of the second layer structure 2. The two ends of the output shaft 491 pass through the fixed gears 46 on both sides and are fixedly connected to the two sets of rotating arms 48 respectively. The second driver 49 drives the output shaft 491 to rotate, which in turn drives the rotating arms 48 on both sides of the lower seat cushion A2 to rotate synchronously.

[0047] like Figure 1 and 3 As shown, a headrest 5 that can fold forward is installed at the upper end of the backrest 1. A second drive mechanism 6 is provided on the backrest 1, which can drive the headrest 5 to rotate back and forth relative to the upper end of the backrest 1. During the process of assembling the seat into a bed, the second drive mechanism 6 drives the headrest 5 to rotate forward 90 degrees so that after the backrest 1 is folded flat to the front end of the lower seat cushion A2, the headrest 5 can contact the floor of the vehicle and support the front end of the backrest 1, thereby improving the stability of the bed structure.

[0048] To ensure the comfort and aesthetics of the seat, the front end of the seat cushion assembly typically has a certain curvature. When the backrest 1 is placed horizontally at the front end of the lower seat cushion A2, there is a gap between the rear end of the backrest 1 and the front end of the lower seat cushion A2. Therefore, referring to... Figure 2 In this embodiment, a downwardly extending blocking member 7 is provided at the lower end of the backrest 1, and the blocking member 7 is arranged along the width direction of the backrest 1. (Refer to...) Figure 3 When the backrest 1 is folded flat forward at the front of the seat cushion assembly, the covering part 7 can cover the gap between the rear end of the backrest 1 and the front end of the lower seat cushion A2, improving the overall aesthetics of the seat.

[0049] Furthermore, the shielding component 7 is a flexible cover, with its upper end connected to the lower end of the backrest 1. With this design, the shielding component 7 will not interfere with other components when the backrest 1 moves, ensuring the smoothness of the backrest 1 during rotation.

[0050] In this embodiment, a tilt adjustment mechanism is provided between the lower seat cushion A2 and the base A1. This mechanism drives the lower seat cushion A2 to move relative to the base A1, thereby adjusting the tilt angle of the lower seat cushion A2. This design allows for a small range of tilt angle adjustment of the seat cushion assembly in a seated position, meeting the user's comfort needs. After the backrest 1 rotates to the front of the seat cushion assembly, the tilt angle of the lower seat cushion A2 can be adjusted via the tilt adjustment mechanism to make the upper side of the lower seat cushion A2 flush with the upper side of the backrest 1, thus ensuring the flatness of the surface after the backrest 1 and the lower seat cushion A2 are connected. Adjusting the tilt angle of the seat cushion is existing technology and will not be described in detail here.

[0051] Please refer to Figure 7 and 8 A support plate A5, made of elastic material, is fixed on the lower seat cushion A2. This design ensures the flatness and comfort of the lower seat cushion A2 surface when the upper seat cushion A3 is flipped backward. Furthermore, when the seat is in a seated position, the upper seat cushion A3 overlaps the lower seat cushion A2, and the support plate A5 provides elastic support, further enhancing the user's comfort.

[0052] Based on the above structural design, the car seat provided in this embodiment also has a one-click bed-forming function. Its working principle is as follows: The first drive mechanism 3 drives the lower end of the swing arm 2 to rotate forward around the base A1, causing the backrest 1 at the upper end of the swing arm 2 to flatten forward to the front end of the seat cushion assembly. Then, the flipping drive mechanism 4 drives the upper seat cushion A3 to flip backward relative to the lower seat cushion A2 to a horizontal state, thereby realizing the independent transformation of the car seat into a bed. By realizing the independent bed-forming function of the car seat, the number of operation steps can be reduced, the overall vehicle intelligence can be improved, and it has technical advantages such as good space adaptability and excellent overall appearance.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A car seat capable of independently transforming into a bed, comprising a base (A1), a seat cushion assembly disposed on the base (A1), and a backrest (1) disposed at the rear end of the seat cushion assembly, characterized in that: The backrest (1) has a swing arm (2) extending toward the base (A1) on its side. The lower end of the swing arm (2) is rotatably connected to the base (A1). The swing arm (2) rotates forward relative to the base (A1), which allows the backrest (1) to be tilted forward and connected to the front end of the seat cushion assembly. The seat cushion assembly includes an upper seat cushion (A3) and a lower seat cushion (A2) arranged in an overlapping manner. The upper seat cushion (A3) can be flipped backward relative to the lower seat cushion (A2) to a horizontal state. A flipping drive mechanism (4) is provided between the upper seat cushion (A3) and the lower seat cushion (A2), which is used to drive the upper seat cushion (A3) to flip backward relative to the lower seat cushion (A2); The flipping drive mechanism (4) includes a drive assembly, a first gear (41) fixedly mounted on the rear end of the lower seat cushion (A2), a second gear (42) rotatably mounted on the rear end of the upper seat cushion (A3), and a retainer (A4); the drive assembly is used to drive the second gear (42) to rotate around the first gear (41) in the circumferential direction; The two ends of the retainer (A4) are respectively rotatably sleeved at the axial positions of the first gear (41) and the second gear (42) so that the second gear (42) and the first gear (41) can maintain a continuous meshing state.

2. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The base (A1) is provided with a first drive mechanism (3) for rotating the lower end of the drive swing arm (2).

3. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The drive assembly includes a third gear (43) rotatably mounted on the rear end of the lower seat cushion (A2) and a first driver (44) that drives the third gear (43) to rotate. The third gear (43) is coaxially arranged with the first gear (41) and meshes with the second gear (42).

4. The automobile seat capable of independently transforming into a bed according to claim 3, characterized in that: The transmission ratio between the first gear (41), the second gear (42) and the third gear (43) is 1:1:

1.

5. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The side of the backrest (1) is rotatably connected to the upper end of the swing arm (2), and an electric angle adjuster (9) is provided between the side of the backrest (1) and the upper end of the swing arm (2).

6. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The lower end of the swing arm (2) is rotatably positioned at the middle of the base (A1) along its length.

7. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The upper end of the backrest (1) is equipped with a headrest (5) that can be folded forward. The backrest (1) is provided with a second drive mechanism (6) for driving the headrest (5) to rotate back and forth relative to the upper end of the backrest (1).

8. The automobile seat capable of independently transforming into a bed according to claim 1, characterized in that: The backrest (1) has a downwardly extending shielding member (7) at the lower end of the back side. When the backrest (1) is tilted forward and flattened at the front end of the seat cushion assembly, the shielding member (7) can cover the gap between the backrest (1) and the seat cushion assembly.

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